It was spring in the Northern hemisphere when this image was taken on May 21, 2017, at 13:21 local Mars time
The image was taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter. Over the winter, snow and ice have inexorably covered the dunes. Unlike on Earth, this snow and ice is carbon dioxide, better known to us as dry ice.
Image credit: NASA/JPL/University of Arizona Larger image
